Rotation Structure

ABSTRACT

A rotation structure includes a main body, two bearings mounted in the main body, a mandrel mounted between the two bearings, a rotation member having a first end connected with the mandrel, and a weight mounted on a second end of the rotation member. The rotation member is situated at a center of the mandrel and is perpendicular to the mandrel. The rotation member and the weight have a total length smaller than a radius of the main body. Thus, the weight is rotated in the main body without producing sound so that the main body is operated in a noiseless manner and will not produce noise during movement.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to an exercising device and, more particularly, to a rotation structure, such as a gyro grip centrifugal force fitness trainer, a fitness centrifugal ring or the like, that provides an exercising effect.

2. Description of the Related Art

A conventional rotation structure in accordance with the prior art shown in FIGS. 5 and 6 comprises a main body 50 having an interior provided with a ball space 64, and a weighting ball 70 rolling in the ball space 64. The ball space 64 is defined by two walls 65 and an annular slideway 66. The weighting ball 70 is rolling in the annular slideway 66 and is limited by the two walls 65. The main body 50 includes two shells 61 and 62 combined together. Each of the two shells 61 and 62 has a mounting face 63, and the mounting faces 63 of the two shells 61 and 62 are juxtaposed to each other. The main body 50 has an exterior provided with two finger holes 52 and two handles 54. In operation, the user's two hands hold and move the two handles 54 so that the main body 50 is rotated, and the weighting ball 70 is rolling in the ball space 64 to produce a centrifugal force. At this time, the two handles 54 function as a pivot fulcrum, and the weighting ball 70 is rolling in the annular slideway 66 and is limited by the two walls 65. In such a manner, the user's two hands has to overcome the centrifugal force produced by the weighting ball 70 so as to achieve an exercising effect. Thus, the conventional rotation structure exercises the user's two hands. However, the weighting ball 70 frequently rubs the annular slideway 66 and the two walls 65 and produces sound loudly during rolling, thereby causing disturbance to the user. In addition, the main body 50 cannot be operated at the night to prevent from causing disturbance to the neighbor.

BRIEF SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a rotation structure that is noiseless during operation.

In accordance with the present invention, there is provided a rotation structure comprising a main body, two bearings mounted in the main body, a mandrel mounted between the two bearings, a rotation member having a first end connected with the mandrel, and a weight mounted on a second end of the rotation member. The main body includes two shells combined together. The main body has an exterior provided with two finger holes and two operation portions. The two finger holes correspond to the two operation portions respectively. The main body has an interior provided with a receiving chamber and two mounting recesses. The mandrel has two ends pivotally mounted on the two bearings. The mandrel is received in the receiving chamber. The two bearings are mounted in the two mounting recesses respectively. The rotation member is situated at a center of the mandrel. The rotation member is perpendicular to the mandrel. The rotation member and the weight have a total length smaller than a radius of the main body.

According to the primary advantage of the present invention, the main body is operated in a noiseless manner and will not produce noise during movement to prevent from causing disturbance to other people during the exercising process so that the rotation structure is operated at any time.

According to another advantage of the present invention, the rotation structure provides an exercising effect to train the user's hands, wrists, and feet.

According to a further advantage of the present invention, the rotation structure has a simplified construction to decrease the cost of fabrication and production.

According to a further advantage of the present invention, the rotation structure is assembled easily and conveniently.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

FIG. 1 is a perspective view of a rotation structure in accordance with the preferred embodiment of the present invention.

FIG. 2 is an exploded perspective view of a rotation structure in accordance with the preferred embodiment of the present invention.

FIG. 3 is a cross-sectional operational view of the rotation structure in accordance with the preferred embodiment of the present invention.

FIG. 4 is another cross-sectional operational view of the rotation structure in accordance with the preferred embodiment of the present invention.

FIG. 5 is an exploded perspective view of a conventional rotation structure in accordance with the prior art.

FIG. 6 is a cross-sectional operational view of the conventional rotation structure in accordance with the prior art.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1 and 2, a rotation structure in accordance with the preferred embodiment of the present invention comprises a main body 10, two bearings 34 mounted in the main body 10, a mandrel 30 mounted between the two bearings 34, a rotation member 32 having a first end connected with the mandrel 30, and a weight 36 mounted on a second end of the rotation member 32.

The main body 10 includes two shells 20 and 21 juxtaposed to each other and combined together. The main body 10 has an exterior provided with two finger holes 12 and two operation portions 14. The two finger holes 12 correspond to the two operation portions 14 respectively. The main body 10 has an interior provided with a receiving chamber 22 and two mounting recesses 24. The receiving chamber 22 is defined in the two shells 20 and 21.

The mandrel 30 has two ends pivotally mounted on the two bearings 34. The mandrel 30, the rotation member 32 and the weight 36 are received in the receiving chamber 22 when the two shells 20 and 21 cover each other. The two bearings 34 are mounted in the two mounting recesses 24 respectively when the two shells 20 and 21 cover each other.

The rotation member 32 is situated at a center of the mandrel 30 and is located between the mandrel 30 and the weight 36. The rotation member 32 is perpendicular to the mandrel 30. The rotation member 32 and the weight 36 have a total length smaller than a radius of the main body 10. The weight 36 is rotatable in the receiving chamber 22.

In the preferred embodiment of the present invention, each of the two operation portions 14 is a handgrip.

In the preferred embodiment of the present invention, each of the two operation portions 14 has an arcuate shape.

In the preferred embodiment of the present invention, each of the two operation portions 14 is provided with a nonslip portion 16.

In the preferred embodiment of the present invention, the rotation member 32 is a rod or pole.

In the preferred embodiment of the present invention, the rotation structure further comprises four positioning members 40 extending through the two shells 20 and 21 to secure the two shells 20 and 21. The four positioning members 40 are situated at upper ends and lower ends of the two operation portions 14.

In the preferred embodiment of the present invention, each of the two shells 20 and 21 has a periphery provided with at least one insertion projection 261 and at least one insertion slot 262. The at least one insertion projection 261 of one of the two shells 20 and 21 is inserted into the at least one insertion slot 262 of the other one of the two shells 20 and 21 when the two shells 20 and 21 are juxtaposed to each other. Thus, the thickness of the two shells 20 and 21 is reduced, and the whole weight of the main body 10 is reduced.

In the preferred embodiment of the present invention, each of the two shells 20 and 21 has an interior provided with a plurality of first connecting portions 281 and a plurality of second connecting portions 282. The first connecting portions 281 of one of the two shells 20 and 21 are connected with the second connecting portions 282 of the other one of the two shells 20 and 21 when the two shells 20 and 21 are juxtaposed to each other, to enhance the combination strength of the main body 10.

In the preferred embodiment of the present invention, the mandrel 30 is disposed at a center of each of the two shells 20 and 21.

In operation, referring to FIG. 3 with reference to FIGS. 1 and 2, the user's two hands hold and move the two operation portions 14 so that the main body 10 is rotated, and the rotation member 32 and the weight 36 are pivoted about the mandrel 30 to produce a centrifugal force. At this time, the two operation portions 14 function as a pivot fulcrum. In such a manner, the user's two hands has to overcome the centrifugal force produced by the weight 36 so as to achieve an exercising effect. Thus, the rotation structure exercises the user's two hands. At this time, the weight 36 is combined with the rotation member 32 and will not rub the inner wall of the two shells 20 and 21 to prevent from producing noise during rotation of the weight 36 so that the main body 10 is operated smoothly and will not produce noise during movement.

Alternatively, referring to FIG. 4 with reference to FIGS. 1 and 2, the user's two palms pass through the two finger holes 12 and press the main body 10 to direct hold and move the main body 10 so that the main body 10 is rotated, and the rotation member 32 and the weight 36 are pivoted about the mandrel 30 to produce a centrifugal force. At this time, the two finger holes 12 function as a pivot fulcrum. In such a manner, the user's two hands has to overcome the centrifugal force produced by the weight 36 so as to achieve an exercising effect. Thus, the rotation structure exercises the user's two hands. At this time, the weight 36 is combined with the rotation member 32 and will not rub the inner wall of the two shells 20 and 21 to prevent from producing noise during rotation of the weight 36 so that the main body 10 is operated smoothly and will not produce noise during movement.

Alternatively, the user's two feet hold and move the two operation portions 14 so that the main body 10 is rotated, and the rotation member 32 and the weight 36 are pivoted about the mandrel 30 to produce a centrifugal force. At this time, the two operation portions 14 function as a pivot fulcrum. In such a manner, the user's two feet has to overcome the centrifugal force produced by the weight 36 so as to achieve an exercising effect. Thus, the rotation structure exercises the user's two feet. At this time, the weight 36 is combined with the rotation member 32 and will not rub the inner wall of the two shells 20 and 21 to prevent from producing noise during rotation of the weight 36 so that the main body 10 is operated smoothly and will not produce noise during movement.

Accordingly, the main body 10 is operated in a noiseless manner and will not produce noise during movement to prevent from causing disturbance to other people during the exercising process so that the rotation structure is operated at any time. In addition, the rotation structure provides an exercising effect to train the user's hands, wrists, and feet. Further, the rotation structure has a simplified construction to decrease the cost of fabrication and production. Further, the rotation structure is assembled easily and conveniently.

Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the scope of the invention. 

1. A rotation structure comprising: a main body; two bearings mounted in the main body; a mandrel mounted between the two bearings; a rotation member having a first end connected with the mandrel; and a weight mounted on a second end of the rotation member; wherein: the main body includes two shells combined together; the main body has an exterior provided with two finger holes and two operation portions; the two finger holes correspond to the two operation portions respectively; the main body has an interior provided with a receiving chamber and two mounting recesses; the mandrel has two ends pivotally mounted on the two bearings; the mandrel is received in the receiving chamber; the two bearings are mounted in the two mounting recesses respectively; the rotation member is situated at a center of the mandrel; the rotation member is perpendicular to the mandrel; and the rotation member and the weight have a total length smaller than a radius of the main body.
 2. The rotation structure as claimed in claim 1, wherein each of the two operation portions is a handgrip.
 3. The rotation structure as claimed in claim 1, wherein each of the two operation portions has an arcuate shape.
 4. The rotation structure as claimed in claim 1, wherein each of the two operation portions is provided with a nonslip portion.
 5. The rotation structure as claimed in claim 1, wherein the rotation member is a rod.
 6. The rotation structure as claimed in claim 1, further comprising: four positioning members extending through the two shells to secure the two shells; wherein the four positioning members are situated at upper ends and lower ends of the two operation portions.
 7. The rotation structure as claimed in claim 1, wherein: each of the two shells has a periphery provided with at least one insertion projection and at least one insertion slot; and the at least one insertion projection of one of the two shells is inserted into the at least one insertion slot of the other one of the two shells when the two shells are juxtaposed to each other.
 8. The rotation structure as claimed in claim 1, wherein: each of the two shells has an interior provided with a plurality of first connecting portions and a plurality of second connecting portions; and the first connecting portions of one of the two shells are connected with the second connecting portions of the other one of the two shells when the two shells are juxtaposed to each other. 